National Weather Service meteorologists say patchy frost is possible in the greater Grand Rapids area after Friday. The temperature at the weather service office near Gerald R. Ford Airport is expected to dip to about 38 degrees in the early morning hours of Saturday.

It could go lower in some outlying areas.

But meteorologists say areas with the most significant chances of serious frost are in northern lower Michigan, near Cadillac.

Those with outdoor plants may want to cover tender vegetation, the weather experts say.